如何数据库表数据导出到excel中

1.首先须要有一个NPOI

2.接下来上代码

 private void button1_Click(object sender, EventArgs e)
 {
 //1.通过Ado.net读取数据
 string sql = "SELECT * FROM ASRS_F1";
 using (SqlDataReader reader = SqlHelper.ExecuteReader(sql, CommandType.Text))
 {
 //如果读到数据
 if (reader.HasRows)
 {
 IWorkbook wk = new HSSFWorkbook();
 ISheet sheet = wk.CreateSheet("ASRS_F1");

 #region 创建第一行，设置列名
 //--------------------------------------------------
 //创建第一行，第一行表示列名
 IRow rowHead = sheet.CreateRow();
 //循环查询出的每一列
 for (int col = ; col < reader.FieldCount; col++)
 {
 rowHead.CreateCell(col).SetCellValue(reader.GetName(col));
 }
 //--------------------------------------------------
 #endregion

 int rindex = ;
 //下面是创建数据行
 while (reader.Read())
 {
 //ID, Position, AName, ACode, AState, ABatch, ADateTime, BName, BCode, BState, BBatch, BDateTime, IsMoving, IsType
 IRow currentRow = sheet.CreateRow(rindex);
 rindex++;
 int Id = reader.GetInt32();
 string Position = reader.GetString();
 string AName = reader.GetString();
 string ACode = reader.GetString();
 string AState = reader.GetString();
 string ABatch =reader.IsDBNull()?null: reader.GetString();
 DateTime? lockDate = reader.IsDBNull() ? null : (DateTime?)reader.GetDateTime();
 string BName = reader.GetString();
 string BCode = reader.GetString();
 string BState = reader.GetString();
 string BBatch = reader.IsDBNull()?null:reader.GetString();
 DateTime? lockDates = reader.IsDBNull() ? null : (DateTime?)reader.GetDateTime();
 string IsMoving = reader.GetString();
 string IsType = reader.GetString();

 currentRow.CreateCell().SetCellValue(Id);
 currentRow.CreateCell().SetCellValue(Position);
 currentRow.CreateCell().SetCellValue(AName);
 currentRow.CreateCell().SetCellValue(ACode);
 currentRow.CreateCell().SetCellValue(AState);
 currentRow.CreateCell().SetCellValue(ABatch);
 if (lockDate == null)
 {
 //如果是null值，那么就像excel写入一个单元格，这个单元格的类型就是Blank
 currentRow.CreateCell().SetCellType(CellType.BLANK);
 }
 else
 {

 //创建一个单元格
 ICell cellLockDate = currentRow.CreateCell();

 //创建一个单元格样式
 ICellStyle cellStyle = wk.CreateCellStyle();
 cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("m/d/yy h:mm");
 //设置当前单元格应用cellStyle样式
 cellLockDate.CellStyle = cellStyle;

 cellLockDate.SetCellValue((DateTime)lockDate);
 }
 currentRow.CreateCell().SetCellValue(BName);
 currentRow.CreateCell().SetCellValue(BCode);
 currentRow.CreateCell().SetCellValue(BState);
 currentRow.CreateCell().SetCellValue(BBatch);

 if (lockDates == null)
 {
 //如果是null值，那么就像excel写入一个单元格，这个单元格的类型就是Blank
 currentRow.CreateCell().SetCellType(CellType.BLANK);
 }
 else
 {

 //创建一个单元格
 ICell cellLockDate = currentRow.CreateCell();

 //创建一个单元格样式
 ICellStyle cellStyle = wk.CreateCellStyle();
 cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("m/d/yy h:mm");
 //设置当前单元格应用cellStyle样式
 cellLockDate.CellStyle = cellStyle;

 cellLockDate.SetCellValue((DateTime)lockDates);
 }
 currentRow.CreateCell().SetCellValue(IsMoving);
 currentRow.CreateCell().SetCellValue(IsType);
 }

 //写入
 using (FileStream fsWrite = File.OpenWrite("半成品库存表.xls"))
 {
 wk.Write(fsWrite);
 }
 label1.Text = "写入成功！" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
 }
 else
 {
 label1.Text = "没有查询到任何数据";
 }
 }

 }